László was born on December 23rd, 1933 in Felpéc.1 László's father was György Körtvélyesi and his mother was Teréz Simon. His paternal grandparents were István Körtvélyesi and Zsófia Tóth. He had two brothers named Elemér and Gyula. He was the youngest of the three children. He died at the age of 66 on January 10th, 2000 in Győr.1